| 摘要 |
A line voltage surge protection device for telephone systems which normally include means for grounding excessive currents caused by strokes of lightening and the like. The device includes a gaseous discharge element which becomes conductive when the voltage in the line being protected momentarily exceeds a predetermined value to conduct current to a source of ground potential. A temperature sensitive element which operates upon the presence of a prolonged current serves to short the gaseous discharge element whereby the surge is conducted directly to ground potential. The temperature sensitive element includes means resiliently biasing the gaseous element for movement in a direction serving to short the same. A soldered retaining means opposes such movement, and heat developed in a coil in series with the line to be protected melts the solder permitting the shorting action to occur.
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